The old method was to set the expansions value in the variable table. The current value for that is 16383 which you get by using 2^N -1 where N is the expansion number. That particular method doesn't appear to have been updated for quite some time now.
Another method is to set min_level or min_status in the zone table then update it or change it whenever the players complete a specific task. This method will probably use quest_globals or heavy scripting
It may be possible to accomplish this by other methods as well.
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